Which test best assesses myocardial perfusion under stress and helps identify ischemia before high-risk surgery?

• A. Echocardiography
• B. Electrocardiography at rest
• C. Cardiac catheterization
• D. Nuclear myocardial perfusion imaging (stress test)

Answer: (D)

Assessing inducible myocardial ischemia through stress-induced perfusion is the key idea. Nuclear myocardial perfusion imaging uses a radiotracer to visualize blood flow to the heart at rest and during stress (exercise or pharmacologic). If the stressed study shows reduced tracer uptake in a region that normalizes at rest, that’s a reversible perfusion defect, indicating inducible ischemia and higher perioperative cardiac risk. This information helps decide whether to optimize medical therapy, pursue revascularization before surgery, or proceed with the planned operation.

This test is particularly useful because it directly measures perfusion under stress and provides prognostic information, while remaining noninvasive. In contrast, a resting ECG won’t reveal stress-induced ischemia, echocardiography (even stress-induced) mainly assesses wall motion and may miss some perfusion abnormalities, and invasive cardiac catheterization evaluates anatomy and is more invasive, with a higher barrier to use purely for perfusion assessment. The perfusion-focused nuclear test offers a direct, actionable view of blood flow under stress before high-risk surgery.